• Lecanora stenotropa Nyl.
Lecanora stenotropa
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This tiny lichen with minute (<1mm diam.), L. polytropa-like discs grows on coarse sandstone walls and monuments, often close to a source of base-rich run-off, for example, mortar, cement. The slightly shiny discs which are never green are smaller and paler than in L. polytropa and have grey rims surrounding pale brown centres on a greenish cracked thallus. Spot tests unhelpful. The spores are 3-4ųm wide. North of Ireland only.

Key characteristics

  • Thallus scurfy greenish with very small, scattered, grey-brown discs sometimes densely compressed into angular shapes; spores never wider than 4ųm
  • On sandstones near to base-rich run-off: bridges, headstones, monuments, etc.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Lecanora stenotropa Nyl.. [In] LichenIreland. Accessed on 2018-07-19.